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20121114
20121114
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we call firn. it's an old swiss term that's still used today. so eventually the firn itself gets more compact, more recrystallized, and it becomes glacier ice. subject to extreme, instantaneous stress, ice shatters like glass. but if stress such as gravity is applied gradually over a long period of time, the ice bends. this process, called plastic deformation, explains how glaciers move. generally, ice must accumulate to a thickness of approximately 20 meters before movement starts. pulled by gravity, ice in a glacier typically shifts down slope a few millimeters per day. to study glacial flow, louis agassiz and his students built a hut on the ice itself. they observed that the center of the glacier moved most quickly, while friction slowed down movement along its sides. a similar phenomenon is observed in rivers and streams. scientists like agassiz also wanted to understand how glaciers flow internally. but it wasn't until early in the post-world war ii era that glaciologists were able to drill a hole through a swiss glacier. and this was a hole several hundred meters deep, maybe a c
. de acuerdo. should you be using destinos for a credited course you should also know that the telecourse is accompanied by written materials consisting of a textbook, two workbooks audio cassettes and additional computer-guided study. the materials are easy to use. before watching an episode, you should first complete that part of the lesson called "preparación" which will review highlights of the previous episode and help you get ready to watch the current episode. after watching the episode you should return to the textbook and complete the section called "¿tienes buena memoria?" you should continue through the rest of the textbook lesson before beginning with the workbook. in both the textbook and the workbook are checklists to help you keep track of your progress before moving on to the next lesson. now it is time to watch the first episode of destinos. the story begins in mexico not too long ago. la gavia, a 16th-century hacienda near mexico. it was just a week ago that the family doctor was summoned to the grand estate. la gavia is owned by a wealthy industria
Search Results 0 to 1 of about 2